Does a grandmother have any legal rights to a child if the father is not on the birth certificate and is under the age of 18?

Okay, wel you have two very different issues and questions going on here.  First, let me state that any one can call social services on any one if they think that there is an issue with the safety and well being of a child.  Certain people - like teachers and doctors - are what are known as mandatory reporters of cases that involve children and their best interests.  As for whether or not the allegations will hold up after investigation that is a different story.  Now, as for her rights, yes, grandparents have rights in the state of Wisconsin.  They are under the laws that deal with rights of third parties.  She can go to court and assert them at any time. The fact that the father is not on the birth certificate may not matter if it has been estalished that he is fact the father.  I would speak with some one on this matter right away to help you otain the court order you need to establish your rights here.  A grandparent's rights are not primary to a parents rights.  Good luck.